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Stock-Based Compensation (Tables)
 9 Months Ended
Sep. 30, 2016
Restricted stock [Member]  
Summary of Changes in Non-vested Shares of Restricted Stock Outstanding
A summary of changes in non-vested restricted shares outstanding for the nine months ended September 30, 2016 is presented below. 
 
 
Number of
non-vested
shares
 
Weighted average
grant-date
fair value
Non-vested restricted shares outstanding at December 31, 2015
 
3,249,611

 
$
48.20

Granted
 
2,025,885

 
21.81

Vested
 
(1,084,804
)
 
39.90

Forfeited
 
(151,437
)
 
41.13

Non-vested restricted shares outstanding at September 30, 2016
 
4,039,255

 
$
37.46